document.onload=checkCookie()

function getCookie(c_name)
{
    if (document.cookie.length > 0)
    {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1)
        {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}

function setCookie(c_name, value, expiredays)
{
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + escape(value) +
                      ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}

function checkCookie()
{
    var pin = getCookie('pin');
    if (pin == null || pin == "")
    {
        pin = prompt('Please enter your pin:', "");
        setCookie('pin', pin, 1);
    }
}

function logout(){
    setCookie('pin', "", 1);
}

function decrypt(html){
    var pin = getCookie('pin');
    var result = ""
    for(i=0; i < html.length; i++){
        result += String.fromCharCode(pin ^ html.charCodeAt(i))
    }
    return result
}

function checkKey()
{
    var KeyID = event.keyCode;
    alert(KeyID)
}